Abstract
Abstract We present follow-up observations of two galaxy clusters detected blindly via the Sunyaev-Zel’dovich (SZ) effect and released in the Planck Early Release Compact Source Catalogue. We use the Arcminute Microkelvin Imager, a dual-array 14–18 GHz radio interferometer. After radio source subtraction, we find a SZ decrement of integrated flux density -1.08 ± 0.10 mJy towards PLCKESZ G121.11+57.01, and improve the position measurement of the cluster, finding the centre to be RA 12th59m36s.4, Dec +60°04′46″.8, to an accuracy of 20 arcsec. The region of PLCKESZ G115.71+17.52 contains strong extended emission, so we are unable to confirm the presence of this cluster via the SZ effect.
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